Claims
- 1. An image fixing apparatus, comprising:
- a stationary heater;
- an endless film extending around said heater; and
- a backup rotatable member for forming a nip with said heater with said film therebetween, wherein a recording material carrying an image is passed through a nip between said film and said backup rotatable member by which the image is fixed; and
- wherein said heater is substantially crowned in a direction perpendicular to a movement direction of said film, and said backup rotatable member is substantially reversely crowned in a direction perpendicular to a movement direction of said film.
- 2. An apparatus according to claim 1, wherein said film slides on said heater.
- 3. An apparatus according to claim 1, wherein said backup rotatable member has a rubber layer.
- 4. An apparatus according to claim 1, wherein an amount of crowning of said heater is substantially equal to an amount of reverse-crowning of said backup rotatable member.
- 5. An apparatus according to claim 1, wherein, the heater is crowned 0.05-0.5 mm.
- 6. An apparatus according to claim 1, wherein the backup rotatable member is reversely crowned 0.05-0.5 mm.
- 7. An apparatus according to claim 1, wherein the image to be fixed is made of toner, and wherein a temperature of the toner at a point where the recording material is separated from said film is higher than a glass transition point of the toner.
- 8. An apparatus according to claim 1, wherein said film has a thickness less than 100 microns.
- 9. An apparatus according to claim 8, wherein said film has a thickness less than 40 microns.
- 10. An image fixing apparatus, comprising:
- a stationary heater; and
- an endless film extending around said heater, said film being in press contact with said heater and movable together with a recording material carrying an image to be fixed, wherein the image is heated and fixed by heat from said heater through said film,
- wherein a surface of said heater contactable to said film is substantially crowned in a direction perpendicular to a movement direction of said film, and the heater is crowned 0.05-0.5 mm.
- 11. An apparatus according to claim 10, further comprising a pressing member for pressing the recording material and said film to said heater.
- 12. An apparatus according to claim 10, wherein the image to be fixed is made of toner, and wherein a temperature of the toner at a point where the recording material is separated from said film is higher than a glass transition point of the toner.
- 13. An apparatus according to claim 10, wherein said film has a thickness less than 100 microns.
- 14. An apparatus according to claim 13, wherein said film has a thickness less than 40 microns.
- 15. An image fixing apparatus, comprising:
- a stationary heater;
- an endless film extending around said heater;
- a backup member forming a nip with said film therebetween, wherein a recording material carrying an image to be fixed is passed through the nip between said film and said backup member, by which the image is fixed, wherein a surface of said heater contactable to said film is substantially crowned in a direction perpendicular to a movement direction of said film; and
- a rotatable member, disposed upstream of the nip with respect to a movement direction of the recording material toward said film, for preventing departure of a trailing edge portion of the recording material from the passage.
- 16. An apparatus according to claim 15, wherein the recording material is contactable to said film at its image carrying side.
- 17. An apparatus according to claim 16, wherein said rotatable member includes a spur.
- 18. An apparatus according to claim 15, wherein said pressing member is a rotatable member having a rubber layer.
- 19. An apparatus according to claims 18, wherein a diameter of said rotatable member increases toward longitudinal outsides thereof from its longitudinal central portion.
- 20. An apparatus according to claim 15, wherein said film slides on said heater.
- 21. An apparatus according to claim 15, wherein the heater is crowned 0.05-0.5 mm.
- 22. An apparatus according to claim 15, wherein the image to be fixed is made of toner, and wherein a temperature of the toner at a point where the recording material is separated from said film is higher than a glass transition point of the toner.
- 23. An apparatus according to claim 16, wherein said film has a thickness less than 100 microns.
- 24. An apparatus according to claim 23, wherein said film has a thickness less than 40 microns.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-30650 |
Feb 1990 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/651,015 filed Feb. 4, 1991, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (8)
Number |
Date |
Country |
0295901 |
Dec 1988 |
EPX |
0095571 |
May 1987 |
JPX |
63-76592 |
Apr 1988 |
JPX |
63-82626 |
Apr 1988 |
JPX |
63-91271 |
Apr 1988 |
JPX |
0101850 |
May 1988 |
JPX |
0185579 |
Jul 1989 |
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1128357 |
Sep 1989 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
651015 |
Feb 1991 |
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